S-90291A303 1/4"-28 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with durable nylon 6/6 plastic tip that prevents loosening under dynamic loads
• Excellent corrosion resistance from 18-8 stainless steel construction for long-term reliability in harsh environments
• Precise thread engagement with Class 3A UNF fine threads ensuring secure fastening in critical applications
• Easy installation and removal with 1/8" hex drive design that provides reliable torque transmission
• Surface protection with non-marring nylon tip that prevents damage to contact surfaces
• Wide temperature tolerance from -50° to 250°F for stable performance across various operating conditions
• Space-saving design with headless configuration ideal for compact assemblies and flush mounting

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A nylon tip set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and surface protection are critical. The 18-8 stainless steel construction provides superior corrosion resistance, making it ideal for harsh environments including marine, chemical processing, and outdoor equipment. The green nylon 6/6 plastic tip effectively dampens vibrations while preventing surface marring on shafts, gears, and precision components. With its fine thread configuration and Class 3A thread fit, this hex drive set screw maintains consistent clamping force in high-vibration machinery, automotive assemblies, and precision instruments. The headless design and 1/8" hex drive facilitate installation in confined spaces while ensuring reliable performance across the broad temperature range from -50° to 250°F.

Specification Summary & Compliance

This precision set screw features 1/4"-28 UNF Class 3A threads with fine thread spacing for superior holding power. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness, ensuring dimensional accuracy and mechanical reliability. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards for industrial applications.